2) THE DISCOURAGED BORDERLINE – this category of individuals have characteristics in common with those who suffer from DEPENDENT PERSONALITY DISORDER (clickhere to read my article about this). Milton also describes those who suffer from this subtype of BPD as tending to be :

3) THE IMPULSIVE BORDERLINE – according to Milton, those individuals who fall into this category have characteristics in common with those who suffer from HISTRIONIC PERSONALITY DISORDER (click here to read my article on this). They also :

If, as adults, we have been unfortunate enough to develop borderline personality disorder (BPD), it is quite possible that we have also developed other personality disorders that exist alongside it concurrently (or, more technically, CO-MORBIDLY).

Which Other Personality Disorders May Exist Co-morbidly With BPD?

According to Zanarini (1998) the four personality disorders that are most likely to exist simultaneously alongside (co-morbidly with) BPD are as follows :

The percentages given in brackets after each of the four personality disorders displayed above represent the chances of an individual having that particular personality disorder existing co-morbidly alongside his/her BPD.

Why Is It Common For These Four Personality Disorders To Exist Co-morbidly Alongside BPD?

Avoidant Personality Disorder : BPD sufferers are at risk of also suffering from this because, as children, they are likely to have felt threatened by, and been betrayed by, significant others leading them, as adults, to view people in general as potentially dangerous (to their emotional, or, even, physical well-being) and therefore best kept at a distance.

Dependent Personality Disorder : BPD sufferers are at risk of also suffering from this because they are likely to have grown up in an environment which caused them to fail to develop confidence in their own coping skills and to feel vulnerable, hopeless and helpless.

Paranoid Personality Disorder : BPD sufferers are at risk of also suffering from this because they are likely to have grown up being perpetually harmed by significant others and / or living with the constant fear that significant others may hurt them at any (unpredictable) moment (psychologically, physically or both).

Anti-social Personality Disorder : BPD sufferers are at risk of also suffering from this because, as children, they are likely to have lacked positive role models, been mistreated and abused leading to them, as adults, to have internalized few, if any, positive values, to be distrustful, cynical, angry and resentful. Such feelings can then be projected onto society as a whole and ‘dog -eat-dog’ / ‘every-man-for-himself’ / ‘look-after-number one-because-nobody-else-will’ / ‘everyone -is-essentially-selfish-and-will-ultimately-betray-you’ and nihilistic view of the world may develop.